1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * linux/drivers/mmc/core/sdio_bus.c
4 *
5 * Copyright 2007 Pierre Ossman
6 *
7 * SDIO function driver model
8 */
9
10 #include <linux/device.h>
11 #include <linux/err.h>
12 #include <linux/export.h>
13 #include <linux/slab.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/pm_domain.h>
16 #include <linux/acpi.h>
17 #include <linux/sysfs.h>
18
19 #include <linux/mmc/card.h>
20 #include <linux/mmc/host.h>
21 #include <linux/mmc/sdio_func.h>
22 #include <linux/of.h>
23
24 #include "core.h"
25 #include "card.h"
26 #include "sdio_cis.h"
27 #include "sdio_bus.h"
28
29 #define to_sdio_driver(d) container_of_const(d, struct sdio_driver, drv)
30
31 /* show configuration fields */
32 #define sdio_config_attr(field, format_string, args...) \
33 static ssize_t \
34 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
35 { \
36 struct sdio_func *func; \
37 \
38 func = dev_to_sdio_func (dev); \
39 return sysfs_emit(buf, format_string, args); \
40 } \
41 static DEVICE_ATTR_RO(field)
42
43 sdio_config_attr(class, "0x%02x\n", func->class);
44 sdio_config_attr(vendor, "0x%04x\n", func->vendor);
45 sdio_config_attr(device, "0x%04x\n", func->device);
46 sdio_config_attr(revision, "%u.%u\n", func->major_rev, func->minor_rev);
47 sdio_config_attr(modalias, "sdio:c%02Xv%04Xd%04X\n", func->class, func->vendor, func->device);
48
49 #define sdio_info_attr(num) \
50 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
51 { \
52 struct sdio_func *func = dev_to_sdio_func(dev); \
53 \
54 if (num > func->num_info) \
55 return -ENODATA; \
56 if (!func->info[num - 1][0]) \
57 return 0; \
58 return sysfs_emit(buf, "%s\n", func->info[num - 1]); \
59 } \
60 static DEVICE_ATTR_RO(info##num)
61
62 sdio_info_attr(1);
63 sdio_info_attr(2);
64 sdio_info_attr(3);
65 sdio_info_attr(4);
66
67 static struct attribute *sdio_dev_attrs[] = {
68 &dev_attr_class.attr,
69 &dev_attr_vendor.attr,
70 &dev_attr_device.attr,
71 &dev_attr_revision.attr,
72 &dev_attr_info1.attr,
73 &dev_attr_info2.attr,
74 &dev_attr_info3.attr,
75 &dev_attr_info4.attr,
76 &dev_attr_modalias.attr,
77 NULL,
78 };
79 ATTRIBUTE_GROUPS(sdio_dev);
80
sdio_match_one(struct sdio_func * func,const struct sdio_device_id * id)81 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
82 const struct sdio_device_id *id)
83 {
84 if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
85 return NULL;
86 if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
87 return NULL;
88 if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
89 return NULL;
90 return id;
91 }
92
sdio_match_device(struct sdio_func * func,const struct sdio_driver * sdrv)93 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
94 const struct sdio_driver *sdrv)
95 {
96 const struct sdio_device_id *ids;
97
98 ids = sdrv->id_table;
99
100 if (ids) {
101 while (ids->class || ids->vendor || ids->device) {
102 if (sdio_match_one(func, ids))
103 return ids;
104 ids++;
105 }
106 }
107
108 return NULL;
109 }
110
sdio_bus_match(struct device * dev,const struct device_driver * drv)111 static int sdio_bus_match(struct device *dev, const struct device_driver *drv)
112 {
113 struct sdio_func *func = dev_to_sdio_func(dev);
114 const struct sdio_driver *sdrv = to_sdio_driver(drv);
115
116 if (sdio_match_device(func, sdrv))
117 return 1;
118
119 return 0;
120 }
121
122 static int
sdio_bus_uevent(const struct device * dev,struct kobj_uevent_env * env)123 sdio_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
124 {
125 const struct sdio_func *func = dev_to_sdio_func(dev);
126 unsigned int i;
127
128 if (add_uevent_var(env,
129 "SDIO_CLASS=%02X", func->class))
130 return -ENOMEM;
131
132 if (add_uevent_var(env,
133 "SDIO_ID=%04X:%04X", func->vendor, func->device))
134 return -ENOMEM;
135
136 if (add_uevent_var(env,
137 "SDIO_REVISION=%u.%u", func->major_rev, func->minor_rev))
138 return -ENOMEM;
139
140 for (i = 0; i < func->num_info; i++) {
141 if (add_uevent_var(env, "SDIO_INFO%u=%s", i+1, func->info[i]))
142 return -ENOMEM;
143 }
144
145 if (add_uevent_var(env,
146 "MODALIAS=sdio:c%02Xv%04Xd%04X",
147 func->class, func->vendor, func->device))
148 return -ENOMEM;
149
150 return 0;
151 }
152
sdio_bus_probe(struct device * dev)153 static int sdio_bus_probe(struct device *dev)
154 {
155 struct sdio_driver *drv = to_sdio_driver(dev->driver);
156 struct sdio_func *func = dev_to_sdio_func(dev);
157 const struct sdio_device_id *id;
158 int ret;
159
160 id = sdio_match_device(func, drv);
161 if (!id)
162 return -ENODEV;
163
164 ret = dev_pm_domain_attach(dev, false);
165 if (ret)
166 return ret;
167
168 atomic_inc(&func->card->sdio_funcs_probed);
169
170 /* Unbound SDIO functions are always suspended.
171 * During probe, the function is set active and the usage count
172 * is incremented. If the driver supports runtime PM,
173 * it should call pm_runtime_put_noidle() in its probe routine and
174 * pm_runtime_get_noresume() in its remove routine.
175 */
176 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
177 ret = pm_runtime_get_sync(dev);
178 if (ret < 0)
179 goto disable_runtimepm;
180 }
181
182 /* Set the default block size so the driver is sure it's something
183 * sensible. */
184 sdio_claim_host(func);
185 if (mmc_card_removed(func->card))
186 ret = -ENOMEDIUM;
187 else
188 ret = sdio_set_block_size(func, 0);
189 sdio_release_host(func);
190 if (ret)
191 goto disable_runtimepm;
192
193 ret = drv->probe(func, id);
194 if (ret)
195 goto disable_runtimepm;
196
197 return 0;
198
199 disable_runtimepm:
200 atomic_dec(&func->card->sdio_funcs_probed);
201 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
202 pm_runtime_put_noidle(dev);
203 dev_pm_domain_detach(dev, false);
204 return ret;
205 }
206
sdio_bus_remove(struct device * dev)207 static void sdio_bus_remove(struct device *dev)
208 {
209 struct sdio_driver *drv = to_sdio_driver(dev->driver);
210 struct sdio_func *func = dev_to_sdio_func(dev);
211
212 /* Make sure card is powered before invoking ->remove() */
213 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
214 pm_runtime_get_sync(dev);
215
216 drv->remove(func);
217 atomic_dec(&func->card->sdio_funcs_probed);
218
219 if (func->irq_handler) {
220 pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
221 drv->name);
222 sdio_claim_host(func);
223 sdio_release_irq(func);
224 sdio_release_host(func);
225 }
226
227 /* First, undo the increment made directly above */
228 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
229 pm_runtime_put_noidle(dev);
230
231 /* Then undo the runtime PM settings in sdio_bus_probe() */
232 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
233 pm_runtime_put_sync(dev);
234
235 dev_pm_domain_detach(dev, false);
236 }
237
238 static const struct dev_pm_ops sdio_bus_pm_ops = {
239 SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
240 SET_RUNTIME_PM_OPS(
241 pm_generic_runtime_suspend,
242 pm_generic_runtime_resume,
243 NULL
244 )
245 };
246
247 static const struct bus_type sdio_bus_type = {
248 .name = "sdio",
249 .dev_groups = sdio_dev_groups,
250 .match = sdio_bus_match,
251 .uevent = sdio_bus_uevent,
252 .probe = sdio_bus_probe,
253 .remove = sdio_bus_remove,
254 .pm = &sdio_bus_pm_ops,
255 };
256
sdio_register_bus(void)257 int sdio_register_bus(void)
258 {
259 return bus_register(&sdio_bus_type);
260 }
261
sdio_unregister_bus(void)262 void sdio_unregister_bus(void)
263 {
264 bus_unregister(&sdio_bus_type);
265 }
266
267 /**
268 * __sdio_register_driver - register a function driver
269 * @drv: SDIO function driver
270 * @owner: owning module/driver
271 */
__sdio_register_driver(struct sdio_driver * drv,struct module * owner)272 int __sdio_register_driver(struct sdio_driver *drv, struct module *owner)
273 {
274 drv->drv.name = drv->name;
275 drv->drv.bus = &sdio_bus_type;
276 drv->drv.owner = owner;
277
278 return driver_register(&drv->drv);
279 }
280 EXPORT_SYMBOL_GPL(__sdio_register_driver);
281
282 /**
283 * sdio_unregister_driver - unregister a function driver
284 * @drv: SDIO function driver
285 */
sdio_unregister_driver(struct sdio_driver * drv)286 void sdio_unregister_driver(struct sdio_driver *drv)
287 {
288 drv->drv.bus = &sdio_bus_type;
289 driver_unregister(&drv->drv);
290 }
291 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
292
sdio_release_func(struct device * dev)293 static void sdio_release_func(struct device *dev)
294 {
295 struct sdio_func *func = dev_to_sdio_func(dev);
296
297 if (!(func->card->quirks & MMC_QUIRK_NONSTD_SDIO))
298 sdio_free_func_cis(func);
299
300 /*
301 * We have now removed the link to the tuples in the
302 * card structure, so remove the reference.
303 */
304 put_device(&func->card->dev);
305
306 kfree(func->info);
307 kfree(func->tmpbuf);
308 kfree(func);
309 }
310
311 /*
312 * Allocate and initialise a new SDIO function structure.
313 */
sdio_alloc_func(struct mmc_card * card)314 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
315 {
316 struct sdio_func *func;
317
318 func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
319 if (!func)
320 return ERR_PTR(-ENOMEM);
321
322 /*
323 * allocate buffer separately to make sure it's properly aligned for
324 * DMA usage (incl. 64 bit DMA)
325 */
326 func->tmpbuf = kmalloc(4, GFP_KERNEL);
327 if (!func->tmpbuf) {
328 kfree(func);
329 return ERR_PTR(-ENOMEM);
330 }
331
332 func->card = card;
333
334 device_initialize(&func->dev);
335
336 /*
337 * We may link to tuples in the card structure,
338 * we need make sure we have a reference to it.
339 */
340 get_device(&func->card->dev);
341
342 func->dev.parent = &card->dev;
343 func->dev.bus = &sdio_bus_type;
344 func->dev.release = sdio_release_func;
345
346 return func;
347 }
348
349 #ifdef CONFIG_ACPI
sdio_acpi_set_handle(struct sdio_func * func)350 static void sdio_acpi_set_handle(struct sdio_func *func)
351 {
352 struct mmc_host *host = func->card->host;
353 u64 addr = ((u64)host->slotno << 16) | func->num;
354
355 acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
356 }
357 #else
sdio_acpi_set_handle(struct sdio_func * func)358 static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
359 #endif
360
sdio_set_of_node(struct sdio_func * func)361 static void sdio_set_of_node(struct sdio_func *func)
362 {
363 struct mmc_host *host = func->card->host;
364
365 func->dev.of_node = mmc_of_find_child_device(host, func->num);
366 }
367
368 /*
369 * Register a new SDIO function with the driver model.
370 */
sdio_add_func(struct sdio_func * func)371 int sdio_add_func(struct sdio_func *func)
372 {
373 int ret;
374
375 dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
376
377 sdio_set_of_node(func);
378 sdio_acpi_set_handle(func);
379 device_enable_async_suspend(&func->dev);
380 ret = device_add(&func->dev);
381 if (ret == 0)
382 sdio_func_set_present(func);
383
384 return ret;
385 }
386
387 /*
388 * Unregister a SDIO function with the driver model, and
389 * (eventually) free it.
390 * This function can be called through error paths where sdio_add_func() was
391 * never executed (because a failure occurred at an earlier point).
392 */
sdio_remove_func(struct sdio_func * func)393 void sdio_remove_func(struct sdio_func *func)
394 {
395 if (sdio_func_present(func))
396 device_del(&func->dev);
397
398 of_node_put(func->dev.of_node);
399 put_device(&func->dev);
400 }
401
402